I do my best to keep to the speed limits in game. For me, I am looking to simulate driving a truck in the correct manner.
This also includes looking both ways at junctions when I can see players on my map. In a busy area this can take a little while before it being safe to pull out (much to the frustration of players behind me that probably just want to pull Infront of someone.
Driving slower and making sure I'm good to pull out are key things that help me to avoid accidents and slow me to have fun without impacting someone else's fun.
Something to think about though.
If a simulation is to simulate the real world, then you have to expect people to speed and for things to go wrong. On my drive to and from work each day, I see plenty of people racing around, plenty of people that get in the wrong lane just to cut everyone up at the end.
So without it, would it really be a simulation?